It is secular spiritual music, the gospel blues. It's music from the heart instead of the head.
Charlie MusselwhiteWhen (Big) Walter was in the right mood, he could be the most ferocious, the most inventive, the most dangerous harp player I ever heard.
Charlie MusselwhiteThe harmonica is the most voice-like instrument, you can make it wail, feel happy, or cry. It's like singing the blues without words.
Charlie Musselwhite